280 lines
9.7 KiB
Java
280 lines
9.7 KiB
Java
/*
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* Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6844193
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* @key intermittent
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* @compile -XDignore.symbol.file MaxRetries.java
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* @run main/othervm/timeout=300 MaxRetries
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* @summary support max_retries in krb5.conf
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*/
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import javax.security.auth.login.LoginException;
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import java.io.*;
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import java.net.DatagramSocket;
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import java.security.Security;
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public class MaxRetries {
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static int idlePort = -1;
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static CommMatcher cm = new CommMatcher();
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public static void main(String[] args)
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throws Exception {
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System.setProperty("sun.security.krb5.debug", "true");
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OneKDC kdc = new OneKDC(null).writeJAASConf();
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// An idle UDP socket to prevent PortUnreachableException
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DatagramSocket ds = new DatagramSocket();
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idlePort = ds.getLocalPort();
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cm.addPort(idlePort);
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cm.addPort(kdc.getPort());
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System.setProperty("java.security.krb5.conf", "alternative-krb5.conf");
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Security.setProperty("krb5.kdc.bad.policy", "trylast");
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// We always make the real timeout to be 1 second
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BadKdc.setRatio(0.25f);
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rewriteMaxRetries(4);
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// Explanation: In this case, max_retries=4 and timeout=4s.
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// For AS-REQ without preauth, we will see 4 4s timeout on kdc#1
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// ("a4" repeat 4 times), and one 4s timeout on kdc#2 ("b4"). For
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// AS-REQ with preauth, one 4s timeout on kdc#2 (second "b4").
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// we tolerate 4 real timeout on kdc#2, so make it "(b4){2,6}".
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test1("a4a4a4a4b4b4", "a4a4a4a4(b4){2,6}");
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test1("b4b4", "(b4){2,6}");
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BadKdc.setRatio(1f);
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rewriteMaxRetries(1);
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// Explanation: Since max_retries=1 only, we could fail in 1st or 2nd
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// AS-REQ to kdc#2.
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String actual = test1("a1b1b1", "(a1b1b1|a1b1x|a1b1b1x)");
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if (actual.endsWith("x")) {
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// If 1st attempt fails, all bads are back available
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test1("a1b1b1", "(a1b1b1|a1b1x|a1b1b1x)");
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} else {
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test1("b1b1", "(b1b1|b1x|b1b1x)");
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}
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BadKdc.setRatio(0.2f);
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rewriteMaxRetries(-1);
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test1("a5a5a5b5b5", "a5a5a5(b5){2,4}");
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test1("b5b5", "(b5){2,4}");
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BadKdc.setRatio(0.25f);
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Security.setProperty("krb5.kdc.bad.policy",
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"tryless:1,1000");
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rewriteMaxRetries(4);
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test1("a4a4a4a4b4a4b4", "a4a4a4a4(b4){1,3}a4(b4){1,3}");
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test1("a4b4a4b4", "a4(b4){1,3}a4(b4){1,3}");
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BadKdc.setRatio(1f);
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rewriteMaxRetries(1);
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actual = test1("a1b1a1b1", "(a1b1|a1b1x|a1b1a1b1|a1b1a1b1x)");
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if (actual.endsWith("x")) {
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test1("a1b1a1b1", "(a1b1|a1b1x|a1b1a1b1|a1b1a1b1x)");
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} else {
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test1("a1b1a1b1", "(a1b1|a1b1x|a1b1a1b1|a1b1a1b1x)");
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}
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BadKdc.setRatio(.2f);
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rewriteMaxRetries(-1);
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test1("a5a5a5b5a5b5", "a5a5a5(b5){1,2}a5(b5){1,2}");
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test1("a5b5a5b5", "a5(b5){1,2}a5(b5){1,2}");
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BadKdc.setRatio(1f);
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rewriteMaxRetries(2);
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if (BadKdc.toReal(2000) > 1000) {
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// Explanation: if timeout is longer than 1s in tryLess,
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// we will see "a1" at 2nd kdc#1 access
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test1("a2a2b2a1b2", "a2a2(b2){1,2}a1(b2){1,2}");
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} else {
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test1("a2a2b2a2b2", "a2a2(b2){1,2}a2(b2){1,2}");
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}
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BadKdc.setRatio(1f);
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rewriteUdpPrefLimit(-1, -1); // default, no limit
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test2("UDP");
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rewriteUdpPrefLimit(10, -1); // global rules
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test2("TCP");
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rewriteUdpPrefLimit(10, 10000); // realm rules
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test2("UDP");
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rewriteUdpPrefLimit(10000, 10); // realm rules
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test2("TCP");
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ds.close();
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}
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/**
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* One round of test for max_retries and timeout.
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*
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* @param exact the expected exact match, where no timeout
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* happens for real KDCs
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* @param relaxed the expected relaxed match, where some timeout
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* could happen for real KDCs
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* @return the actual result
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*/
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private static String test1(String exact, String relaxed) throws Exception {
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ByteArrayOutputStream bo = new ByteArrayOutputStream();
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PrintStream oldout = System.out;
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System.setOut(new PrintStream(bo));
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boolean failed = false;
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long start = System.nanoTime();
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try {
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Context c = Context.fromJAAS("client");
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} catch (LoginException e) {
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failed = true;
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}
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System.setOut(oldout);
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String[] lines = new String(bo.toByteArray()).split("\n");
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System.out.println("----------------- TEST (" + exact
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+ ") -----------------");
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// Result, a series of timeout + kdc#
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StringBuilder sb = new StringBuilder();
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for (String line: lines) {
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if (cm.match(line)) {
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System.out.println(line);
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sb.append(cm.kdc()).append(cm.timeout());
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}
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}
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if (failed) {
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sb.append("x");
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}
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System.out.println("Time: " + (System.nanoTime() - start) / 1000000000d);
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String actual = sb.toString();
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System.out.println("Actual: " + actual);
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if (actual.equals(exact)) {
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System.out.println("Exact match: " + exact);
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} else if (actual.matches(relaxed)) {
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System.out.println("!!!! Tolerant match: " + relaxed);
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} else {
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throw new Exception("Match neither " + exact + " nor " + relaxed);
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}
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return actual;
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}
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/**
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* One round of test for udp_preference_limit.
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* @param proto the expected protocol used
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*/
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private static void test2(String proto) throws Exception {
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ByteArrayOutputStream bo = new ByteArrayOutputStream();
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PrintStream oldout = System.out;
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System.setOut(new PrintStream(bo));
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Context c = Context.fromJAAS("client");
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System.setOut(oldout);
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int count = 2;
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String[] lines = new String(bo.toByteArray()).split("\n");
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System.out.println("----------------- TEST -----------------");
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for (String line: lines) {
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if (cm.match(line)) {
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System.out.println(line);
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count--;
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if (!cm.protocol().equals(proto)) {
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throw new Exception("Wrong protocol value");
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}
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}
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}
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if (count != 0) {
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throw new Exception("Retry count is " + count + " less");
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}
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}
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/**
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* Set udp_preference_limit for global and realm
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*/
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private static void rewriteUdpPrefLimit(int global, int realm)
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throws Exception {
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BufferedReader fr = new BufferedReader(new FileReader(OneKDC.KRB5_CONF));
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FileWriter fw = new FileWriter("alternative-krb5.conf");
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while (true) {
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String s = fr.readLine();
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if (s == null) {
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break;
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}
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if (s.startsWith("[realms]")) {
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// Reconfig global setting
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fw.write("kdc_timeout = 5000\n");
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if (global != -1) {
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fw.write("udp_preference_limit = " + global + "\n");
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}
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} else if (s.trim().startsWith("kdc = ")) {
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if (realm != -1) {
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// Reconfig for realm
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fw.write(" udp_preference_limit = " + realm + "\n");
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}
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}
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fw.write(s + "\n");
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}
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fr.close();
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fw.close();
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sun.security.krb5.Config.refresh();
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}
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/**
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* Set max_retries and timeout value for realm. The global value is always
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* 3 and 5000.
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*
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* @param value max_retries and timeout/1000 for a realm, -1 means none.
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*/
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private static void rewriteMaxRetries(int value) throws Exception {
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BufferedReader fr = new BufferedReader(new FileReader(OneKDC.KRB5_CONF));
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FileWriter fw = new FileWriter("alternative-krb5.conf");
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while (true) {
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String s = fr.readLine();
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if (s == null) {
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break;
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}
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if (s.startsWith("[realms]")) {
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// Reconfig global setting
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fw.write("max_retries = 3\n");
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fw.write("kdc_timeout = " + BadKdc.toReal(5000) + "\n");
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} else if (s.trim().startsWith("kdc = ")) {
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if (value != -1) {
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// Reconfig for realm
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fw.write(" max_retries = " + value + "\n");
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fw.write(" kdc_timeout = " + BadKdc.toReal(value*1000) + "\n");
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}
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// Add a bad KDC as the first candidate
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fw.write(" kdc = localhost:" + idlePort + "\n");
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}
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fw.write(s + "\n");
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}
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fr.close();
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fw.close();
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sun.security.krb5.Config.refresh();
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}
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}
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